Method of and apparatus for making nutless bolts and rivets



Dec. 1, 1925.- 1.563.965

A. CHRESTIANSON METHOD OF AND APPARATUS FOR MAKING NUTLESS BOLTS AND RIVETS Filed May 5, 1923 iNVENTCR .7 ,Q'WALW,

UNITED STATES PATEN T OFFICE.

ANDREVI' CHRISTIANSGIT, OF BUTLER, PENNSYLVANIA.

METI-IGD OF AND APPARATUS FOR FEAKING NUTLEQS BOLTS AND RIVETS.

Application filed May 3,

To a?! LU/207M it may concern:

lie it known that I, Axons-w Cnnisrms- $03., a citizen of the United States, and resident of Butler, in the county of Butler and State of Pennsylvania, have invented a new and useful Improvement in Methods of and Apparatus for llfaking Nutless Bolts and Rivets; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to nut-less bolts and rivets for use in fastening wood, steel and other materials, and it has special reference tesuch bolts and rivets having split shanks and adapter. to be secured in place by upsetting and separating the split end of the shank.

The object of my invention is to provide an improved method of making split nutless bolts and rivets consisting in shearing the end of the shank, thereby splitting the end of the shank lengthwise, and displacing half of the split portion from the other half, and then compressing the split portion of the shank so as to return the two halves to t eir original position.

Another feature of my improved method consists in providing a notch in the end of the bolt or rivet which enables the halves of the bolt to be quickly separated vhen the bolt is being secured in position. This notch may be formed in the bolt at any stage of its manufacture, but is preferably produced during the shearing operation.

In the accompanying drawing, Fig. 1 is a front elevational view of a pair of shearing dies adapted to carry out my present in vention, showing the dies opened and a blank in position for shearing; Fig. 2 is a front elevational view of the same construotion, showing the dies closed and the blank sheared; F ig. 3 is a view taken on the line 33 of Fig. 2; Figs. 4 and 5 are front elevational views similar to Figs. 1 and 2, respectively, showing, in Fig. 4, a sheared blank in position to be straightened and, in Fig. 5, the end of the straightening operation; Fig. 6 is a vertical sectional view taken substantially on the line 6-6, Fig. 5; Fig. 7 is a horizontal sectional view taken substantially on the line 77, Fig. 2-; Fig. 8 shows two side views of the blank after the shearing operation; Fig. 9 shows two side views of a finished bolt after the straightening operation; and Fig. 10 is a sectional.

1923. Serial No. 6%,426.

view showing the manner in which the bolt is fastened in position.

In the drawing the numeral 2 indicates a stationary die and the numeral 3 is a vertically movable die which cooperates with the stationary die 2. The stationary die 2 has a recess 4: in which is an offset 5 form.- ing a to receive a blank 6 and also forming a stationary shear blade. The die also has a semi-circular recess '2' to re ceive the sheared blank in the straightening operation.

The upper movable die 3 carries a gauge plate 9 which is removably secured to the die, as shown in Fig. 3 and acts as a stop to the position of the blanks in the dies. The upper die also carries a projection 10 adapted to extend into the recess l in the lower die and having near its upper end a curved shearing blade 11 which is inclined downwardly, as shown in Figs. 1 and l. The projection 10 prevents the movable shears from shifting laterally during the shearing operation.

Below the shearing blade 11 and carried by the gauge plate 9 is a vertical blade 12 which travels ahead of the shearing blade 11 and forms a V-notch in the end of the blank 6 just before the blank is sheared. ii groove 13 is formed in the lower die 2 below the offset 5 to receive the blade 12 when it passes below the blank. The upper die 3 also has a semi-circular recess 14 which cooperates with the recess 7 in the stationary die and straightens the sheared blanks.

The relation of the blades or die members 7 l1 and 12 to each other and to the movable die 8 by which they are carried, is shown more clearly in Fig. 3 wherein the cutting portion of the blade 11 is inclined or angularly disposed as indicated by the lower dotted line, so that the shearing action will commence at the outer end of the bolt and gradually move toward the head thereof. With respect to the blade 12, the extreme cutting edge thereof is indicated by the lead line in Fig. 3, and as the blades 11 and 12 are carried by a common member and moved synchronously, it will be seen that the blade 12 will move across the end of the bolt, cutting or scoring a notch therein, before the blade 11 reaches shearing position.

In operating this apparatus to produce a nutless bolt, a headed blank 6 is placed in the seat formed by the offset 5 in the lower die, and the upper die 3 is caused to descend. The vertical blade 12 forms a notch 15 in the end of the blank and immediately thereafter the inclined shearing blade 11 engages and shears the end of the blank. The fact that the outermost portion of the blade 11 first engages the end of the blank and has moved below the fixed portion of the blank 6, by the time that the blank has been sheared a sufiicient distance along its length, half of it is deflected to the inclined position shown at 16 on Figs. 2 and. 8, the other half 17 being supported by the offset 5.

Tshen the dies again separate. the sheared blank is removed from the shearing die and placed in the straightening die, as shown in Fig. l. On the next stroke of the upper die the offset sheared portion 16 is bent l'iack into its original straight position, as shown in Fig. 5. \V-hile this is being done a new lank may be sheared by the shearing dies or, if desired, each bolt may be completed before shearing a new blank.

The completed belt or rivet is shown in Fig. 9, the sheared end portion 16 and 1''? being divided at 18 and the notch in the end of the bolt being shown at 15-.

Fig. 10 shows the manner in which a bolt or rivet of this kind is fastened in position to secure together two members 19 and 20 which may be plates. beams, planks or the like of wood or metal. The bolt is thrust through openings in the pieces to be joined, and a suitable implement 21 is placed against the head of the bolt. A pointed instrument 22, such as the end of a chisel, is then inserted in the notch 15 in the end of the bolt, and is driven lengthwise of the bolt, thereby separating the split ends into positions shown in. dotted. lines on Fig. 10. If the pointed instrument is not available for this purpose, the two halves of the bolt may be upset by means of a hammer, the notch 15 being sufficiently wide to permit either half of the end of the bolt to be struck without striking the other half.

It is to be understood that my invention is not restricted to the use of the exact details of construction herein shown and described, but may be carried out by any other suitable apparatus and may be otherwise varied within the scope of the appended claims.

I. claim as my invention:

1. The method of making split bolts and the like that comprises forming a V-notch in the end of the blank by movement of a cutting die thereacross and by the same movementshearing the end of the blank lengthwise in the line of said notch.

2. Apparatus for making split bolts and the like that comprises a stationary die forming a seat for a portion of the bolt, a movable die, a notching blade carried by the movable die, and a shearing blade carried by said die at such distance to the rear of the notching blade that the notching blade has moved past the bolt before the shearing blade is brought into contact therewith.

In testimony whereof I the said ANDREW CHRISTIANSON, have hereunto set my hand.

ANDREW CHRISTIANSON. 

